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Posted By: Mike.Ban additional vapour barrier under the plasterboard
Posted By: jamesingramWhy would you need a membrane taped at joins and touching top of rafters and insulation to make it windtight?if the rafter was fully filled with PUR all gaps foamed it would be windtight anyway.if you dont allow felt/membrane to bag in the traditional way between rafters/counter battons then any water getting through to felt/membrane may run through nail holes.dont we want a bit of wind to flow round this area anyway to remove any mositure forming on cold side of insulation ?Pulling it tight and sitting in flat on top as discribed seems pointless.
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